Magnesium dynamics in decomposing foliar litter – A synthesis

Berg, Björn; Sun, Tao; Johansson, Maj‐Britt; Sanborn, Paul; Ni, Xiangying; Åkerblom, Staffan; Lönn, Mikael

doi:10.1016/j.geoderma.2020.114756

Cited by 12 publications

(9 citation statements)

References 22 publications

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“…Unlike Ca dynamics in the decomposing foliar litter, although with some fluctuations, Mg generally showed a release pattern in our study, which was in line with our first hypothesis and some previous studies [36,38,47,54]. Generally, as an easily leachable nutrient, Mg is an important constituent of chlorophyll; thus, it is easy to be leached out from plant litter in the early decomposition stage [36,38]. However, in the late decomposition stage, such a lack of an easily leachable nutrient may prevent or simply stop the microbial…”

Section: Ca Mg and Mn Dynamics During Decompositionsupporting

confidence: 93%

Section: Ca Mg and Mn Dynamics During Decompositionsupporting

confidence: 93%

“…Generally, as an easily leachable nutrient, Mg is an important constituent of chlorophyll; thus, it is easy to be leached out from plant litter in the early decomposition stage [36,38]. However, in the late decomposition stage, such a lack of an easily leachable nutrient may prevent or simply stop the microbial decomposition [38], which is why there was a relative increase in Mg concentration and amount during the period of 14-24 months in our study.…”

Section: Ca Mg and Mn Dynamics During Decompositionmentioning

confidence: 68%

“…Likewise, the importance of Mn for litter decomposition, especially in the late decomposition stage, has been significantly highlighted in recent studies, as Mn is a key component of the lignin-degrading enzyme manganese peroxidase (MnP), produced by white-rot fungi [31,35]. Moreover, in addition to studying the rates and mechanisms of litter decomposition, most studies have focused on the release of C and key nutrients, such as N and phosphorus (P), from decomposing litter, the dynamics of mineral nutrients have been largely ignored [33,[35][36][37][38]. Significant knowledge gaps and uncertainties remain regarding the dynamics of mineral nutrients such as Ca, Mg, and Mn in decomposing litter, particularly under the background of rapid global changes.…”

Section: Introductionmentioning

confidence: 99%

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The Responses of Leaf Litter Calcium, Magnesium, and Manganese Dynamics to Simulated Nitrogen Deposition and Reduced Precipitation Vary with Different Decomposition Stages

Zhou

Yan

et al. 2021

Forests

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Litter decomposition is a vital link between material circulation and energy flow in forest ecosystems and is intensely affected by global change factors, such as increased nitrogen (N) deposition and altered precipitation regimes. As essential nutrients, calcium (Ca), magnesium (Mg), and manganese (Mn) play crucial roles in plant energy metabolism, photosynthesis, and membrane transport of plants, and the major source of these nutrients is litter decomposition. However, the dynamics of Ca, Mg, and Mn during decomposition have been largely ignored. Thus, to better understand Ca, Mg, and Mn dynamics during leaf litter decomposition in the scenario of increasing N deposition and decreasing precipitation, we carried out a two-year field litterbag experiment in a natural evergreen broad-leaved forest in the central area of the rainy area of Western China. Two levels of N deposition (ambient N deposition and 150 kg·N·ha−1·y−1) and precipitation reduction (no throughfall reduction and 10% throughfall reduction) were set, i.e., control (Ctr: without nitrogen deposition or throughfall reduction), N deposition (N, 150 kg·N·ha−1·y−1), throughfall reduction (T, 10% throughfall reduction), and N deposition and throughfall reduction (NT, 150 kg·N·ha−1·y−1 and 10% throughfall reduction). We found that leaf litter Ca concentration increased in the early decomposition stage and then decreased, while Mg and Mn concentrations generally decreased during the whole period of decomposition. The amount of Ca showed an accumulation pattern, while Mg and Mn generally showed a release pattern. N deposition and throughfall reduction affected the Ca, Mg, and Mn dynamics, varying with different decomposition stages; i.e., N deposition significantly affected the concentration and amount of Ca, regardless of the decomposition stages, while throughfall reduction significantly affected the Ca concentration in the whole and early decomposition stages. N deposition significantly affected the concentration and amount of Mg in the whole and early decomposition stages, while throughfall reduction had no significant effects. Throughfall reduction significantly affected the concentration and amount of Mn in the whole and late decomposition stages, while N deposition had no significant effects. Ca concentration generally showed a significant positive linear relationship with mass loss in the early decomposition stage; Mg concentration showed a significant positive linear relationship with mass loss in the Ctr and N treatments in the early and late decomposition stages; Mn generally showed a significant negative linear relationship with mass loss, regardless of the decomposition stage. Overall, the results suggest that Ca accumulation is more likely affected by N deposition, while Mg and Mn releases are more likely affected by N deposition combined with throughfall reduction, particularly in the early decomposition stage.

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Section: Ca Mg and Mn Dynamics During Decompositionsupporting

confidence: 93%

Section: Ca Mg and Mn Dynamics During Decompositionsupporting

confidence: 93%

Section: Ca Mg and Mn Dynamics During Decompositionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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The Responses of Leaf Litter Calcium, Magnesium, and Manganese Dynamics to Simulated Nitrogen Deposition and Reduced Precipitation Vary with Different Decomposition Stages

Zhou

Yan

et al. 2021

Forests

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“…This contrast in findings may be caused by the uptake and redeposition of Mg by plants within the catchment, making it behave more like the organicallyderived solutes (Jin et al, 2011). Magnesium is a macronutrient for living plants and can be found in the leaf litter of pine species within MEF (Berg et al, 2021). While this process has been found to be minimal in other studies, this could be a driver for high surface concentrations of Mg within MEF, as the Pikes Peak granite bedrock of the area is poor in Mg (Smith, 1999;Jin et al, 2011).…”

Section: Solute Concentrations At Depthmentioning

confidence: 99%

Examining spatial variation in soil solutes and flowpaths in a semi-arid, montane catchment

Gregory

Bush²,

Sullivan³

et al. 2022

Front. Water

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Biogeochemical properties of soils play a crucial role in soil and stream chemistry throughout a watershed. How water interacts with soils during subsurface flow can have impacts on water quality, thus, it is fundamental to understand where and how certain soil water chemical processes occur within a catchment. In this study, ~200 soil samples were evaluated throughout a small catchment in the Front Range of Colorado, USA to examine spatial and vertical patterns in major soil solutes among different landscape units: riparian areas, alluvial/colluvial fans, and steep hillslopes. Solutes were extracted from the soil samples in the laboratory and analyzed for major cation (Li, K, Mg, Br, and Ca) and anion (F, Cl, NO2, NO3, PO4, and SO4) concentrations using ion chromatography. Concentrations of most solutes were greater in near surface soils (10 cm) than in deeper soils (100 cm) across all landscape units, except for F which increased with depth, suggestive of surface accumulation processes such as dust deposition or enrichment due to biotic cycling. Potassium had the highest variation between depths, ranging from 1.04 mg/l (100 cm) to 3.13 mg/l (10 cm) sampled from riparian landscape units. Nearly every solute was found to be enriched in riparian areas where vegetation was visibly denser, with higher mean concentrations than the hillslopes and fans, except for NO3 which had higher concentrations in the fans. Br, NO2, and PO4 concentrations were often below the detectable limit, and Li and Na were not variable between depths or landscape units. Ratioed stream water concentrations (K:Na, Ca:Mg, and NO3:Cl) vs. discharge relationships compared to the soil solute ratios indicated a hydraulic disconnection between the shallow soils (<100 cm) and the stream. Based on the comparisons among depths and landscape units, our findings suggest that K, Ca, F, and NO3 solutes may serve as valuable tracers to identify subsurface flowpaths as they are distinct among landscape units and depth within this catchment. However, interflow and/or shallow groundwater flow likely have little direct connection to streamflow generation.

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Decomposition as a Process—some Main Features

Berg¹,

McClaugherty²

2020

Plant Litter

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Magnesium dynamics in decomposing foliar litter – A synthesis

Cited by 12 publications

References 22 publications

The Responses of Leaf Litter Calcium, Magnesium, and Manganese Dynamics to Simulated Nitrogen Deposition and Reduced Precipitation Vary with Different Decomposition Stages

The Responses of Leaf Litter Calcium, Magnesium, and Manganese Dynamics to Simulated Nitrogen Deposition and Reduced Precipitation Vary with Different Decomposition Stages

Examining spatial variation in soil solutes and flowpaths in a semi-arid, montane catchment

Decomposition as a Process—some Main Features

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